Symptoms

Assume that you set some AppLocker rules to control which applications can run on a computer that is running Windows 7 or Windows Server 2008 R2. However, when you try to start applications that are not blocked by the AppLocker rules, AppLocker incorrectly prevents the applications from running and you receive the following error message:

The system cannot execute the specified program

Cause

AppLocker maintains a cache to store the file attributes of the applications that are installed on a computer. AppLocker uses this cache to look up the file attributes quickly every time that you start an application, instead of computing those attributes again. When the cache reaches its maximum size, AppLocker removes entries from the cache to make room for new entries. Because of an issue in the way that AppLocker purges entries from the cache, the cache can sometimes become corrupted. In this situation, cache lookups start to fail. Therefore, AppLocker prevents applications from running, even though the AppLocker rules that are configured on the computer allow these applications.

The default size of the cache is large enough that most users will not experience this issue for a long time. Users who run lots of applications are more likely to experience this issue, because the cache reaches a size that triggers the purging logic.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes


Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.21xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Discache.sys

6.1.7600.21230

33,280

09-Jun-2012

02:37

x86

Discache.sys

6.1.7601.22015

33,280

09-Jun-2012

02:28

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Discache.sys

6.1.7600.21230

40,960

09-Jun-2012

02:58

x64

Discache.sys

6.1.7601.22015

40,960

09-Jun-2012

02:54

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Discache.sys

6.1.7600.21230

93,184

09-Jun-2012

02:18

IA-64

Discache.sys

6.1.7601.22015

93,184

09-Jun-2012

02:15

IA-64

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File name

X86_14af4431f7119bc9975d3649bc19f519_31bf3856ad364e35_6.1.7600.21230_none_e18b4398c5278956.manifest

File version

Not applicable

File size

701

Date (UTC)

09-Jun-2012

Time (UTC)

09:08

Platform

Not applicable

File name

X86_e9a0a94078d9900448e055c1e12f9a57_31bf3856ad364e35_6.1.7601.22015_none_e25bbf5e3adb1f85.manifest

File version

Not applicable

File size

701

Date (UTC)

09-Jun-2012

Time (UTC)

09:08

Platform

Not applicable

File name

X86_microsoft-windows-systemindexer_31bf3856ad364e35_6.1.7600.21230_none_d62cfdd09d75d3a8.manifest

File version

Not applicable

File size

3,265

Date (UTC)

09-Jun-2012

Time (UTC)

05:08

Platform

Not applicable

File name

X86_microsoft-windows-systemindexer_31bf3856ad364e35_6.1.7601.22015_none_d82dfc209a878665.manifest

File version

Not applicable

File size

3,265

Date (UTC)

09-Jun-2012

Time (UTC)

05:03

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_3901d5a739eebee27fdbb3624409e117_31bf3856ad364e35_6.1.7601.22015_none_124c70570159d9a7.manifest

File version

Not applicable

File size

705

Date (UTC)

09-Jun-2012

Time (UTC)

09:08

Platform

Not applicable

File name

Amd64_e3790bc5118391b20a7264c9aaab5837_31bf3856ad364e35_6.1.7600.21230_none_2ef07aeb15a434de.manifest

File version

Not applicable

File size

705

Date (UTC)

09-Jun-2012

Time (UTC)

09:08

Platform

Not applicable

File name

Amd64_microsoft-windows-systemindexer_31bf3856ad364e35_6.1.7600.21230_none_324b995455d344de.manifest

File version

Not applicable

File size

3,269

Date (UTC)

09-Jun-2012

Time (UTC)

06:05

Platform

Not applicable

File name

Amd64_microsoft-windows-systemindexer_31bf3856ad364e35_6.1.7601.22015_none_344c97a452e4f79b.manifest

File version

Not applicable

File size

3,269

Date (UTC)

09-Jun-2012

Time (UTC)

06:04

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_20955a3bf2a4ad8cf1a1a40ac21240f4_31bf3856ad364e35_6.1.7601.22015_none_ecf08088af9d4175.manifest

File version

Not applicable

File size

703

Date (UTC)

09-Jun-2012

Time (UTC)

09:08

Platform

Not applicable

File name

Ia64_90a3eff49736b803d7d321d6398ca496_31bf3856ad364e35_6.1.7600.21230_none_d4f7cdb64f77ae99.manifest

File version

Not applicable

File size

703

Date (UTC)

09-Jun-2012

Time (UTC)

09:08

Platform

Not applicable

File name

Ia64_microsoft-windows-systemindexer_31bf3856ad364e35_6.1.7600.21230_none_d62ea1c69d73dca4.manifest

File version

Not applicable

File size

3,267

Date (UTC)

09-Jun-2012

Time (UTC)

05:53

Platform

Not applicable

File name

Ia64_microsoft-windows-systemindexer_31bf3856ad364e35_6.1.7601.22015_none_d82fa0169a858f61.manifest

File version

Not applicable

File size

3,267

Date (UTC)

09-Jun-2012

Time (UTC)

05:40

Platform

Not applicable

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